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tv   [untitled]    August 22, 2010 3:30pm-4:00pm PST

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it is not doing damage to the structure. >> the building next to it, let's say it is wood frame. what are thoseeperiods? >> there are less than a second. the beauty of a wood frame building, it is probably the most forgiving construction. it squeaks, the plaster will crack, and if you don't have the soft story to deal with, you just have your cup of coffee and the one with your life. >> i guess this is turtle bill. >> grandview, turtle hill, san the mountain, -- sand mound, depending on how long you have been living there. >> this is northwest, of golden gate park. the nearest background, sunset and the richmond district? >> way out to the end, that is for smiley, the veterans hospital. this is for smiley.
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rock, rock, rock, rock, rock. here is hunters point. that rock is called serpent tonight. -- serpentinite. along this zone, there is another rock type, volcanic rock. it is serpentinite. it is a very treacherous rock. if you go up market, you will see it where the met -- barack is exposed in that cut. -- for rock that is exposed in that it is cut. it can be hard work and have the consistency of soap and just slides. why is it like that? it is an intrusion. it is like toothpaste that was extruded through a crack in the earth. that means it was a sheer zone
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or fault, hundreds of millions of years ago, where it actually came up through and bubbled out and formed this band of serpentinite. adjacent to that is this wonderful rock. what is the other thin that is bad about serpentineite? it contains naturally occurring asbestos, which is a carcinogen, known carcinogen. if you go to where st. mary's cathedral is, cathedral hill, that is one of the outcrops. there is a high percentage of serpentinite in the rock. in the old days, the 1930's, 1920's, san franciscans to not bother to deal with the disposal companies. they would take their garbage out the other side of twin peaks, bump their garbage, and
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shovel sand on top of it. so in the old days, you could go out there and build your home and be surprised that you would find sanitary landfill or construction debris landfills. they were prevalent out there. >> this is twin peaks? >> going up to twin peaks. >> one form does not change much. >> eucalyptus trees have got much taller. that is not halt leading up to predict that is the hill leading up to there. fifth avenue, that area of san francisco. ucsf. that is this area right here. >> it is an earthquake hazard micro zone. >> again, another example of the
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wpa. the streets, they wanted to get to the top of the hill, said the duties beautiful walls and stairways. they are doing well. >> all of these hillsides have catalyzed the design and construction of the interesting foundations and sub framing. >> up there, you'll find quite often, because it is rock, they have dug holes, filled it with concrete, put pulls up, and built their buildings. they have been there actually now 67 years. >> some of these are significant earthquake hazard? >> many of them, because they're not properly braced, because the foundations are not deep enough. the consequences could be significant during an earthquake. >> the tunnel opened that whole section up to development. did that lead to park side? >> west portal is right here.
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it this slope. westport open up this whole area down here, with the reservoir. the tunnel was built and two different ways. one of them was cut and cover, the other was a tunneling machine. as they came close to the side of the hill, they dug down vertically, took out the dirt. they took the dart -- they took the dirt and replaced it as phil -- fill all along the lower part of market street. they filled in the ravine. >> thank you all very much. that was a heck of a tort of san francisco. thank you for your attendance. we hope to see you every third thursday right here.
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>> about four years ago,
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[inaudible] look at how beautiful this was. there is our relationship to the planet. these regions are the wealthiest, the most powerful. that really has impacted the planet. it is almost impossible now to go anywhere and had it really be completely dark. there are very few locations that you can find. that means our relationship to the sky, there is a way where we dominate the sky. we cannot see anything really. we are blinding ourselves in a way.
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>> you can look at the images, they are beautiful. when i started four years ago, there was a conversation about environmental issues that was very different. this is not being talked about in the way it is now. . this has just been like an amazing growth. i anticipate the project to be something that opens a dialogue to public interest in these ideas. so the work is really made to be seen in this environment. it's been show in museum, in
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gallery, but never in a public setting. and it's kind of ideal for both myself and the works to have this real dialogue with the public not only in san francisco but people coming from all over the world. >> since the dawn of electricity, that light is something that people feel connected to and inspired by. personally, there is space to keep that alive, just finding balance. the key is to find some balance.
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